#wpp_overlay {
    background-color: rgba(0,0,0,0.5);
    height: 100%;
    left: 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 99999;
}

#wpp_loader {
    left: 50%;
    margin-left: -100px;
    margin-top: -100px;
    position: absolute;
    top: 50%;
}